Designed for Phaser 6700 printers, this waste toner cartridge is a small but essential part of your Xerox machine. During operation of your Xerox printer, some of the toner used inevitably fails to bond properly to the page. To stop this waste toner damaging the mechanisms inside your printer, the waste toner cartridge collects and stores excess toner. When this cartridge fills up it can impair your printer's operation, so it's important to replace it at 25,000 page intervals.